Waste heat-driven exhaust steam cascade recovery system
Innovative system utilizing waste heat over 250 °C for water recovery and energy efficiency, reducing freshwater consumption by over 40% and offering a positive ROI within 5 years.
Overview
The waste heat-driven exhaust steam cascade recovery system is an innovative solution designed to enhance energy efficiency and water resource management in industrial settings. It leverages waste heat above 250 °C as a desorption heat source to facilitate the condensation of exhaust steam from cooling towers, which is typically at 100% relative humidity. This process results in the production of freshwater while reducing waste energy. With a potential to lower freshwater usage by over 40%, the system also promises significant economic benefits with a positive return on investment within five years.
Technical specifications
- Desorption Heat Source: Utilizes waste heat over 250 °C.
- Condensation Process: Exhaust steam undergoes heat exchange with ambient air, condensing to produce water.
- Multi-stage Heat and Mass Exchange: Involves interaction with a hygroscopic solution for deeper drying, facilitated by preheating and vacuum condensation.
- Efficiency: Reduces freshwater use by over 40% and optimizes waste energy recovery.
- Economic Impact: Cost-effective with savings in water treatment and cooling-energy demand, leading to a positive ROI.
Technology readiness level
Currently at TRL 3, the system has undergone numerical simulations and component testing. Future steps include pilot system construction and validation, followed by multi-scale optimization using machine learning to adapt to various conditions, ensuring broader industrial applicability.
About City University Hong Kong
City University of Hong Kong is a comprehensive public research university with a strong applied orientation and global collaborations. Companies engage through co‑located and contract research labs, industry‑sponsored projects, and flexible collaboration terms that streamline pilots on campus or with partners. A cross‑border footprint in Shenzhen and close ties across the Greater Bay Area connect research with rapid prototyping, manufacturing, and field deployment. Research is supported by Hong Kong SAR funding programs and competitive international sources, alongside direct industry contracts. A dedicated technology transfer office manages IP and licensing, complemented by entrepreneurship programs that provide incubation, seed funding, and mentorship for spinouts.
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